Earlier quoted context omitted.
No, not the mentality that created a large website. The mentality that keeps people from creating ways to view the data that benefit the website's users. Craigslist won the market. Now it's time to open up. If craigslist were solely out to monetize this website, that'd be fine. But they don't. They keep some things free and Craig has made a big deal about making money in the categories that needed a charge to prevent…
Craig has made it pretty clear in interviews that he likes the UI the way it is and wants it to stay that way. Reading interviews of Craig and Jim also make clear they attribute a lot of their success to intentionally not providing features. For better or for worse.
37signals, another company that seems to have a decent handle on how to get users, also believes that not providing features is part of why their apps work for so many people.